Englisheerie
adjective
an eerie silence descended over the house:
uncanny, sinister, ghostly, spectral, unnatural, unearthly, preternatural, supernatural, otherworldly, unreal, mysterious, strange, abnormal, odd, curious, queer, weird, bizarre, freakish;
frightening, spine-chilling, hair-raising, blood-curdling, scaring, terrifying, petrifying, chilling;
Scottish eldritch;
informal creepy, scary, spooky, freaky;
British, informal rum.
▷antonyms normal, reassuring.